Chiral symmetry breaking and the Josephson current in a ballistic superconductor–quantum wire–superconductor junction

• Дата: 2004
• Автори: Krive, I.V., Gorelik, L.Y., Shekhter, R.I., Jonson, M.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2004
• Назва видання: Физика низких температур
• Теми: Свеpхпpоводимость, в том числе высокотемпеpатуpная
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/119722
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Chiral symmetry breaking and the Josephson current in a ballistic superconductor–quantum wire–superconductor junction / I.V. Krive, L.Y. Gorelik, R.I. Shekhter, M. Jonson // Физика низких температур. — 2004. — Т. 30, № 5. — С. 535-543. — Бібліогр.: 27 назв. — англ.

We evaluate the Josephson current through a quasi-1D quantum wire coupled to bulk superconductors. It is shown that the interplay of Rashba spin–orbit interaction and Zeeman splitting results in the appearence of a Josephson current even in the absence of any phase difference between the superconductors. In a transparent junction (D≅1) at low temperatures this anomalous supercurrent Jan appears abruptly for a Zeeman splitting of the order of the Andreev level spacing as the magnetic field is varied. In a low transparency (D << 1) junction one has Jan √D under special (resonance) conditions. In the absence of Zeeman splitting the anomalous supercurrent disappears. We have investigated the influence of dispersion asymmetry induced by the Rashba interaction in quasi-1D quantum wires on the critical Josephson current and have shown that the breakdown of chiral symmetry enhances the supercurrent.